Artículo
Integral field spectroscopy of HII region complexes: the outer disc of NGC6946
García Benito, Rubén; Díaz, A.; Hägele, Guillermo Federico
; Pérez Montero, E.; López, Jesús ; Vílchez, J. M.; Pérez, Enrique; Terlevich, Elena ; Terlevich, Roberto ; Rosa González, Daniel
Fecha de publicación:
11/2010
Editorial:
Oxford University Press
Revista:
Monthly Notices Of The Royal Astronomical Society
ISSN:
0035-8711
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Integral field spectroscopy obtained with the Potsdam Multi-Aperture Spectrophotometer Fiber Package (PPak) and the 3.5-m telescope at the Calar Alto Observatory has been used to study an outer H II region complex in the well-studied galaxy NGC 6946. This technique provides detailed maps of the region in different emission lines, yielding spatially resolved information about the physical properties of the gas. The configuration was chosen to cover the whole spectrum from 3600 up to 10 000 Å, allowing the measurement of the near-infrared [S III] lines. We selected four luminous knots to perform a detailed integrated spectroscopic analysis of these structures and of the whole PPak field of view (FOV). For all the knots the electron density has been found to be very similar and below 100 cm−3. The [O III] electron temperature was measured in knots A, B, C and in the integrated PPak field, and was found to be around 8000 K. The temperatures of [O II] and [S III] were estimated in the four cases. The elemental abundances computed from the ‘direct method’ are typical of high-metallicity disc H II regions, with a mean value of 12+log(O/H) = 8.65, comparable to what has been found in this galaxy by other authors for regions at similar galactocentric distance. Therefore a remarkable abundance uniformity is found despite the different excitations found throughout the nebula. However, due to the quality of the data, the electron temperatures and metallicities obtained have associated errors comparable to the typical dispersion found in empirical calibrations.
Palabras clave:
Abundances (Ism)
,
Hii Regions
,
Interstellar Medium
,
Spectroscopic Techniques
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Articulos(IALP)
Articulos de INST.DE ASTROFISICA LA PLATA
Articulos de INST.DE ASTROFISICA LA PLATA
Citación
García Benito, Rubén; Díaz, A.; Hägele, Guillermo Federico; Pérez Montero, E.; López, Jesús ; et al.; Integral field spectroscopy of HII region complexes: the outer disc of NGC6946; Oxford University Press; Monthly Notices Of The Royal Astronomical Society; 408; 4; 11-2010; 2234-2255
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